I'm not an appraiser but a buyer and seller. I would be interested to know whether there are any guidelines, or accepted good practices, regarding justification of large adjustments on the URAR form. In the case I am thinking of, the appraiser has made a 15% ($175,000) adjustment in the Quality of Construction field without proper explanation. Should such a large adjustment be explained in detail and possibly broken down in terms of specific differences between the two properties? What are the guidelines and professional practices on this?